added sl_ls test :shipit:

tests/rules/test_sl_ls.py

@@ -0,0 +1,12 @@
+
+from thefuck.types import Command
+from thefuck.rules.sl_ls import match, get_new_command
+
+
+def test_match():
+    assert match(Command('sl', '', ''), None)
+    assert not match(Command('ls', '', ''), None)
+
+
+def test_get_new_command():
+    assert get_new_command(Command('sl', '', ''), None) == 'ls'